Apparatus for preparing a painted metal surface for repainting

ABSTRACT

An apparatus is provided for preparing an object having a painted metal surface for repainting which apparatus is a combination sand-blasting, degreasing and steam generating and spraying unit. Separate means for directing a stream of abrasive and air, with or without volatile chemical solvent and/or water, on to the metal surface, and separate steam spray means are employed. Compressed air is employed to propel the abrasive, blow away any abrasive dirt and grease build-up on the metal surface and to drive water into the steam generating unit thereby eliminating the need for expensive motors and pumps.

ll lhnted States Patent 1 [11] 3,791,078

lFleisher Feb. 12, 1974 APPARATUS FOR PREPARING A PAINTED METAL SURFACEFOR REPAINTING Primary Examiner-Othell M. Simpson [76] Inventor: HenryFleisher, 18 Notch Park Rd., Exammehm Dams Little Falls, NJ. 07424 22Filed: 061. 19, 1972 [57] ABSTRACT [21] Appl. No.: 299,034 An apparatusis provided for preparing an object havmg a painted metal surface forrepainting which apparatus is a combination sand-blasting, degreasingand U-S- 1, team generating and praying unit Separate means 51/12 fordirecting a stream of abrasive and air, with or withlllt. CI. outvolatile chemical olvent and/or water on to the Field of Search 51/8, 9,11, 15/316 R, metal surface, and separate steam spray means are 15/321,1 102, 137, 138 employed. Compressed air is employed to propel theabrasive, blow away any abrasive dirt and grease [56] References Citedbuild-up on the metal surface and to drive water into UNITED STATESPATENTS the steam generating unit thereby eliminating the need 3,401,0609/1968 Watts 134 102 x for expensive motors and P p 2,409,722 10/1946Stark 3,256,642 6 1966 Fonti 51/11 13 Clam, 10 Drawmg PMENTEDFEB 1 2mm3' 791 7 sum 1 ur a PATENTED FEB I 2l974 MAE-14m;

APPARATUS FOR PREPARING A PAINTED METAL SURFACE FOR REPAINTING FIELD OFTHE INVENTION This invention relates to an apparatus useful in preparinga previously painted surface for repainting and particularly inpreparing automobiles for repainting.

BACKGROUND OF THE INVENTION Many automobiles which are discarded as junkhave nothing more wrong with them than a rusted-out body. In many casesthis can be prevented by a timely repainting of the body of the car. Aswith many things a decision to repaint or not to repaint is determinedto a large extent on cost.

Before a car, truck, or other similar items can be repainted, the oldpaint must be removed and the metallic surface thereunder properlycleaned and prepared to receive a fresh coat of paint. Proper cleansingand preparation also includes removal of grease from the paintedsurfaces. This problem is particularly acute in thecase of trucks, suchas trailor trucks, which after many years on the road accumulate thicklayers of grease especially around the areas of the fifth wheel, that isthe area where the trailer joins the truck, where heavy grease depositsare required. Oil delivery trucks also tend to have heavy greaseaccumulations and thus present unusually difficult problems in preparingtheir bodies for repainting.

Almost all paint removal and surface preparation of cars is done by handby unskilled workers. Therefore, as the minimum cost of labor increases,the cost of repainting cars is directly affected.

In recent years, it has been exceedingly difficult to obtain workers toprepare cars for repainting even at increased wages. As a result, it isnot only more expensive than before to have a car painted, but it isalso more difficult to get the job done.

Therefore, it is an object of this invention to provide a machine forautomatically removing paint and dirt from the surface of an automobileand simultaneously preparing the surface for repainting.

It is another object of this invention to provide a machine forautomatically preparing a car for repainting which removes the paintwithout chipping or gouging the automobile trim.

It is still another object of this invention to provide a machine forautomatically preparing a car for repainting which does not necessitatea drying operating after use of the machine.

It is a further object of this invention to provide a machine which maybe constructed to accommodate a small automobile repainting facilitywhich repaints large numbers of cars and trucks.

BRIEF DESCRIPTION OF THE INVENTION With these and other objects in view,the present invention contemplates an apparatus for removing paint froma surface of an automobile and preparing the surface to receive a newcoat of paint.

The apparatus of the invention comprises, in combination, a sand orother abrasive supplying unit, comprising means for storing abrasiveincluding abrasive inlet means and abrasive outlet means; air supplymeans; first conduit means in communication with the air supply means,the abrasive storage means, as well as the abrasive outlet means, forsupplying compressed air to the storage means to pressurize the same,and to the abrasive outlet to aid in propelling the abrasive; secondconduit means communicating with the first conduit means and theabrasive outlet for carrying mixtures of abrasive and air; and means fordirecting a stream of abrasive and air onto the metal surface, incommunication with the second conduit means. Employed with the abrasivesupplying apparatus is a steam generating means including a water inlet,an air inlet, third conduit means communicating with the air inlet, airsupply means and the water inlet; heating coils; and fuel means forheating the coils; and means for directing steam onto the metal surface,in communication with the steam outlet. The steam generating means makesuse of compressed air for driving water into the heating coils toproduce steam. In a preferred embodiment, the third conduit means of thesteam generating means, is in communication with the air supply meansemployed with the abrasive storage means and/or the first conduit means.

The abrasive supplying means and/or the steam generating means may beemployed in combination with a source of volatile chemical solventand/or water. Thus, the means for directing a stream of abrasive and airmay be employed in communication with means for mixing abrasive-airmixtures with volatile chemical sol vent and/or water which is in turnin communication with a source of volatile chemical solvent and/orwater, and in addition, optionally, in communication with a source ofcompressed air to aid in mixing of the various materials in said mixingmeans.

The steam generating means may be in communication with a source ofvolatile chemical solvent so that a mixture of steam and volatilechemical solvent may be delivered to the metal surface.

The means for directing a stream of abrasive and air will include nozzlemeans, preferably in the form of a pair of flat nozzles pivotallyconnected together to form a variable V-shape. In addition, each of theflat nozzles may be connected via conduit means to air supply meansand/or volatile chemical solvent and/or water. Thus, it is possible toregulate air pressure at the nozzles and close off delivery of abrasive,so that the operator can by high pressure blasts blow away any abrasivebuild-up on the metal surface instantly so that the operator hasconstant vision of the working surface without obstruction fromabrasive. In addition, use of the high pressure air blast alone or inconnection with steam cleaning allows large build-ups of dirt and greasein and around hard to get at areas to be cleaned up, thereby eliminatingthe need for expensive chemical solvents and time consuming cleaningoperation.

In addition, the steam generating means can include a negative or vacuumair pressure at the outlet side of the heating coils and a positive airpressure at the inlet side of the heating coils so that steam may bedelivered under sufficient pressure to pry loose and blow away dirt andgrease deposits on the working surface.

DESCRIPTION OF THE DRAWINGS FIG. 1 shows one embodiment of the apparatusof the invention.

FIG. 2 shows a cross-section of the abrasive inlet means in the closedposition taken along lines 2-2 of FIG. 1.

FIG. 3 is a view of the abrasive inlet means shown in FIG. 2 in an openposition.

FIG. 4 is a perspective view of mixing means for mixing abrasive, air,volatile chemical solvent and/or wa- FIG. 5 is a section of the mixingmeans of FIG. 4 taken along lines 55.

FIG. 6 is a perspective view of a hand instrument including nozzle meansused with the present invention.

FIG. 7 is another view of the hand instrument of FIG. 6.

FIG. 8 is section of the hand instrument of FIG. 6 taken along lines8-8.

FIG. 9 is a schematic representation of the steam generating meansemployed in the apparatus of the invention.

FIG. 10 is a perspective view of a hand instrument employed to deliversteam with or without chemical solvents in accordance with theinvention.

DETAILED DESCRIPTION OF THE INVENTION Referring now to the Figures,wherein like parts are represented by like numerals, in FIG. 1 thenumeral 10 generally represents a sand blasting unit which includes achamber 12 into which sand (or other abrasive) from a reservoir (notshown) is fed through abrasive inlet means 14.

As seen in FIGS. 1 to 3, the abrasive inlet means 14 includes a chute l6and abrasive control means 18 which may take the form ofa closure member20 which completely closes off the chute 16 in its closed position andis pivoted on pivot or shaft 22. The closure member 20 is opened bymoving handle 24 (shown in FIG. 1) in a counter-clockwise motion asshown in FIG. 3.

Abrasive outlet means 26, which includes abrasive control means 28,which can take the form of a valve, communicates with a bottom portion30 of chamber 12.

Air conduit means 32, which communicates with a source of compressed air(not shown), is in communication with chamber 12 via conduit 34 and withabrasive outlet means 26 via conduit 36. Air conduit means 32 includesflow control means (such as a valve) 38 for controlling the flow of airinto chamber 12, and conduit 36 includes flow control means 40 (such asa valve) which in combination with flow control means 38 can regulatethe flow of compressed air passed the abrasive outlet means 28.

Conduit means 42 communicates with conduit means 36 and abrasive outletmeans 26, and carries a mixture of sand (or other abrasive) and air fromchamber 12 and propelled by compressed air flowing through conduit 36.

Referring to FIGS. 1, 4 and 5, conduit means 42, which includes flowcontrol means 43, extends into and terminates in mixing means 44 (notshown in FIG. 1), which includes mixing chamber 46 and mixing outlet 47.

Air conduit means 48 leading from the compressed air source (not shown)extends into mixing chamber 46 as shown in FIG. 5. In addition, conduitmeans 50 which can be connected to a source of volatile chemical solventand/or water (not shown) extends into and terminates in mixing chamber46 as shown in FIG. 5. Conduit means 50 is equipped with flow controlmeans 52 such as a valve, for regulting the flow of volatile chemicalsolvent and/or water into the mixing chamber 46. Air flow throughconduit 48 is regulated by valve control means not shown. Flow of sandand air into the mixing chamber is regulated by control means 43 whichcan take the form of a conventional cut off valve.

As shown in FIG. 5, in a preferred embodiment, the

- conduit 42 for abrasive and air mixture extends deepest into mixingchamber 46, air conduit 48 extends the least amount into chamber 46 andconduit 50 for chemicals and/or water extends into and terminates inmixing chamber 46 intermediate conduits 42 and 48. It has been foundthat with such an arrangement, abrasive and chemical and/or water arepropelled out of the mixing chamber 46 with the aid of the compressedair flowing into conduit 48 and mixing chamber 46. The compressed airfurther substantially eliminates clogging or blockage as the abrasive,chemical, etc. flow out of the mixing chamber 46. Chamber 54 connectsmixing outlet 47 and conduits 56 and 58 as shown in FIG. 4. Conduits 56and 58 will generally take the form of flexible hoses, and terminate inhand instrument 59 which includes nozzles 60 and 62, respectively, asshown in FIGS. 6 and 8. Conduit 56 includes inlet means 64, connected toa source of chemical and/or water, for introducing chemicals and/orwater into nozzle 60, and conduit 58 includes inlet means 66, connectedto a compressed air source, for introducing compressed air into nozzle62.

The nozzles 60 and 62 are preferably of a flat configuration hinged at68 and controlled by adjusting or pivoting the nozzles about hinge 68 towiden or narrow the area covered by the nozzle. The nozzles 60 and 62provide a V-shaped pattern as shown in FIG. 7. The nozzles 60 and 62 maybe separated and employed independently of each other.

The instrument 59 is intended to be used to correct scratches and otherflaws not cleaned by the steam spray portion of the apparatus shown inthe Figures. Thus, the nozzles 60 and 62 interact and are taperedagainst one another causing the outflowing mixture to abrade thesurfaces and to taper the painted surfaces gradually to form a gradualconcave or shallow V- shape. This permits sratches, chips, and nicks tobe painted over without any further sanding which now has to be donemanually through the use of machines. No other slurry streams orcombination of chemical abrasive and air will provide this taperedeffect upon a painted surface. The presently known slurry and sand blastpatterns produce a non-tapered effect.

This effect requires manual treatment by sanding machines to make agradual taper over which fillers and paint can be applied; otherwise adeep grove or scratch effect will be visible upon the completion of thepaint job.

The interaction of the nozzles 60 and 62 makes a double tapermulti-angle abrading action upon the treated surfaces. The instrument 59is preferably operated at an angle less than 45 to the surface beingcleansed.

Referring to FIGS. 1 and 9, there is shown a steam generating andspraying unit generally referred to by the numeral 70 which includesheating coils 74 (shown in FIG. 9), steam chamber 72, water inlet 76which communicates with heating coils 74, steam outlet 78 connected toheating coils 74 via conduit 79, and water source 80 connected to waterinlet 76 via conduit 82 which includes a float or water storage tank 84.The float tank can include a conventional float valve which will causeflow of water from the water source into the tank to cease when thewater level in the float tank reaches a predetermined level.

Compresed air source 86 communicates with water conduit 82 or waterinlet 76 via conduit 88.

Volatile chemical solvent source 90 communicates with water conduit 82or water inlet 76 via conduit 92.

Fuel source 94 communicates via conduit 96 with heating jets (not shown)which heat up the heating coil 74.

Conduit 98 extends from steam outlet 78 and is connected to a vacuumpump 100 or other means for reducing pressure and preferably applying avacuum to conduit 98 thereby facilitating flow of steam from the heatingcoils 74, through conduit 79 and steam outlet 78.

Conduit 102, which can take the form of a flexible hose, is connected toa nozzle 104 as shown in FIG. 10. Nozzle 104 is equipped with additionalinlet means 106, which is closed off in FIG. 10, for regulating thesteam flowing or introducing other fluid such as volatile chemicalsolvent into the nozzle 104.

The entire assembly as described above is preferably positioned on atransportable base 110 provided with wheels 112, and is anchored andsupported by the base as shown in FIG. 1.

The apparatus as shown in the Figures can be employed as follows:

Closure member is opened (as shown in FIG. 3) by moving handle 24 in acounter-clockwise direction. Sand is fed from a reservoir, for example,by gravity feeding into abrasive inlet 14, the mouth of which, as shown,is quite wide to aid in the free flow of the sand into chute 16 andchamber 12.

Thereafter, closure member 20 is returned to the closed position, flowcontrol means 38 is opened and compressed air is passed through conduits32, 34 into the chamber 12.

As the chamber 12 is pressurized by the compressed air, abrasive flowcontrol means 28 in abrasive outlet 26 is opened and pressurized sandfalls into conduit 42. At the same time compressed air is passed viaconduit 32, through control means 38, conduit 36 and control means 40into conduit 42 and thus across the path of the sand as it falls intoconduit 42. The flow of air across the path of the sand is preferablyslightly downward so as not to push the sand back up into the abrasiveoutlet 26 blocking its downward flow. The mixture of sand and air ispropelled by the compressed air and directed into the mixing means 44(shown in FIG. 4).

Compressed air is passed through conduit 48 into the mixing means 44under sufficient pressure to prevent a back-up of sand, air and otherfluid which may be present.

If desired, control means 52 may be opened and water and/or volatilechemical solvent passed from a reservoir (not shown) via conduit 50 intomixing means 44.

By having a separate air supply and fluid supply (chemical solventand/or water) leading into the mixing means 44, the volume of air andpressure of flow out of the mixing means 44 can be separately regulatedby proper adjustment of the air supply source and fluid source.

The mixture of sand, air, water and/or chemical solvent is fed throughchamber 54 into conduits 56 and 58 and into nozzles 60 and 62.

Compressed air may separately be fed via conduit 66 into nozzle 62 tofurther accelerate flow of sand, air and fluid from nozzle 62.Furthermore, flow of sand and air into the mixing means 44 can beregulated and even stopped by closing off regulating means 43. Thus, ifdesired, it is possible to deliver a stream of compressed air withoutsand or fluid and thus the operator can blow away any abrasive build-upinstantly. In this manner the operator will have constant vision of theworking surface. In a similar manner, water and/or volatile chemicalsolvent may be fed via conduit 64 into nozzle 60; by closing off valve43 and the control means of the compressed air supply, it is possible todeliver a stream of water and/or volatile chemical solvent alone vianozzle 60.

Furthermore, the nozzles 60 and 62 can be employed in' conjunction witheach other or alone to deliver a high pressure air blast and/or fluidblast, by manipulat ing the aforementioned control means or valves aswould be apparent to one skilled in the art, to pry loose build-up ofdirt and/or grease on hard-to-get at or trouble areas.

In addition, the nozzles 60 and 62 may be separated into two independentunits so that two different operators may carry out sandblasting, airblasting or water and/or chemical solvent application.

The nozzles 60 and 62 are quickly coupled on and off permitting varioustypes of nozzles to be used for specific purposes.

It will also be understood that conventional pumps or gravity feedingtechniques may be employed to feed the sand and fluids to the variousconduits connecting with the chamber 12, the mixing means 44 and thenozzles 6,0 and 62.

As indicated, the nozzles 60 and 62 when used in conjunction with eachother can be angularly adjusted with respect to each other so that theangle of incidence of the mixtur of sand, air and fluid upon a surfaceto be cleaned can be adjusted so that abrasion rather than chippingoccurs.

The steam generating means operates by feeding water from source andcompressed air from source 86 to the heating coils 76 which areheated'by heating jets fueled from fuel source 94. If desired, volatilechemical solvent from source 90 may also be fed to the heating coils.The heating coils heat up the water and in combination with thenegativepressure (pump at the exit end of the coils, cause steam to flow out ofoutlet 78 into conduits 98 and 102 to nozzle 104. In this manner steamcan be delivered under predetermined pressures without the need forexpensive pumps, motors and the like usually employed in steam sprayingequipment.

Furthermore, a common source of compressed air is preferably employedfor supplying compressed air to the chamber 12 and associated conduitsas well as to the steam generating means for driving water into theheating coils.

As indicated, the nozzles 60 and 62 spray the preparing mixture of sand,air, the highly volatile solvent and- /or water under pressure onto theworking surface of a vehicle.

As the preparing mixture strikes the surface of the vehicle at anoblique angle (i.e., less than 45), the solvent removes film and dirtfrom the surface thereof. The abrasive striking at an oblique angleremoves the paint without chipping. Glass and trim are masked so thatthe impact of the abrasive will not chip or scrape them. It should benoted that if the angle of the mixture strikes the surface is greaterthan 45, there would be a sand blasting effect on the surface, injuringthe same.

The chemical solvent carries away the abrasive and bits of materialremoved from the surface of the vehicle to a suitable drain. The solventwhich does not run off of the surface of the vehicle will evaporatequickly, as it is highly volatile so that relatively little further workmust be done on the surface of the vehicle before repainting isaccomplished. The sand carried by the air and chemical solvent may bebrought through the drain to rest on the surface of a conveyor beltwhich will bring the abrasive back to the supply source thereof. Thesolvent will quickly evaporate and can then be collected by a fumehood(not shown) and then condensed to retain the solvent.

Where it is necessary to remove heavy grease buildup, for example, ontrailer trucks or oil delivery trucks, the apparatus of the inventioncan be employed to simultaneously sand blast, steam spray and deliverchemical solvent to the trouble areas. Where it is desired to removeheavy grease deposits present on the working surface, the angle that theabrasive, solvent or steam strikes the surface is not important untilsubstantially all of the grease is removed. It will be apparent that thegrease deposit itself will act as a barrier to prevent injury to theworking surface.

The entire unit mounted on the movable base described above may beeasily maneuvered around the vehicle and/or the conduits or hosesconnecting up with the nozzles may be of sufficient length to reach anysurface of the vehicle.

It will also be understood that the steam generating means inconjunction with related conduits and nozzles may be used as a steamcleaner, as a hot water pressure washer, or both. Further, the sandblasting unit 10 may be employed as a standard sand blaster whenrequired, as will be apparent to one skilled in the art.

Although this invention has been described with respect to its preferredembodiments, it should be understood that many variations andmodifications will now be obvious to those skilled in the art, and it ispreferred, therefore, that the scope of the invention be limited, not bythe specific disclosure herein, only by the appended claims.

I claim:

1. An apparatus for preparing an object having a painted metal surfacefor repainting comprising, in combination:

means for storing abrasive including inlet means for abrasive and outletmeans for abrasive;

air supply means;

first conduit means in communication with the air supply means, themeans for storing abrasive and the outlet means for abrasive;

second conduit means for carrying mixtures of abrasive and air, incommunication with said first conduit means and said outlet forabrasive;

means for directing a stream of abrasive and air onto said metalsurface, in communication with said second conduit means,

steam generating means including a water inlet, a

steam outlet, an air inlet in communication with said water inlet, and athird conduit means in communication with said air supply means and saidair inlet; and

means for directing steam onto said metal surface, in

communication with said steam outlet.

2. The apparatus as defined in claim 1 including, in addition,

a source of volatile chemical solvent;

a source of water;

means for mixing abrasive-air mixture with volatile chemical solventand/or water, in communication with said second conduit means, saidsources of volatile chemical solvent and/or source of water and saidmeans for directing a stream of abrasive and air onto said metalsurface.

3. The apparatus as defined in claim 2 wherein said means for mixingabrasive-air mixtures with volatile chemical solvent and/or waterincludes fourth conduit means in communication with said air supplymeans.

4. The apparatus as defined in claim 1 wherein said means for directinga stream of abrasive and air includes nozzle means.

5. The apparatus as defined in claim 4 wherein said nozzle meanscomprises a pair of flat nozzles pivotally connected together to form avariable V-shape.

6. The apparatus as defined in claim 5 wherein one of said flat nozzlesinclude fifth conduit means in communication with said air supply andthe other of said flat nozzles includes sixth conduit means incommunication with said source of volatile chemical solvent and/orwater.

7. The apparatus as defined in claim 1 wherein said steam generatingmeans includes in addition, heating coils, including a water intake andsteam outlet sides, in communication with said water and air inlets anda fuel source for heating said coils.

8. The apparatus as defined in claim 6 including means for regulatingthe flow of air into said nozzles.

9. The apparatus as defined in claim 1 including means for regulatingthe amount of abrasive flowing from said abrasive storage means intosaid second conduit means.

10. The apparatus as defined in claim 1 wherein means for regulating theamount of air entering the abrasive storage means and the second conduitmeans.

11. The apparatus as defined in claim 1 including means for regulatingthe amount of air entering the steam generating means.

12. The apparatus as defined in claim 7 including means for reducingpressure of steam flowing out of the steam outlet and into the means fordirecting steam onto the metal surface.

13. The apparatus as defined in claim 1 including a transportable baseupon which the steam generating means and the means for storing abrasiveand relates conduits and components can be carried, to make saidapparatus portable.

1. An apparatus for preparing an object having a painted metal surfacefor repainting comprising, in combination: means for storing abrasiveincluding inlet means for abrasive and outlet means for abrasive; airsupply means; first conduit means in communication with the air supplymeans, the means for storing abrasive and the outlet means for abrasive;second conduit means for carrying mixtures of abrasive and air, incommunication with said first conduit means and said outlet forabrasive; means for directing a stream of abrasive and air onto saidmetal surface, in communication with said second conduit means, steamgenerating means including a water inlet, a steam outlet, an air inletin communication with said water inlet, and a third conduit means incommunication with said air supply means and said air inlet; and meansfor directing steam onto said metal surface, in communication with saidsteam outlet.
 2. The apparatus as defined in claim 1 including, inaddition, a source of volatile chemical solvent; a source of water;means for mixIng abrasive-air mixture with volatile chemical solventand/or water, in communication with said second conduit means, saidsources of volatile chemical solvent and/or source of water and saidmeans for directing a stream of abrasive and air onto said metalsurface.
 3. The apparatus as defined in claim 2 wherein said means formixing abrasive-air mixtures with volatile chemical solvent and/or waterincludes fourth conduit means in communication with said air supplymeans.
 4. The apparatus as defined in claim 1 wherein said means fordirecting a stream of abrasive and air includes nozzle means.
 5. Theapparatus as defined in claim 4 wherein said nozzle means comprises apair of flat nozzles pivotally connected together to form a variableV-shape.
 6. The apparatus as defined in claim 5 wherein one of said flatnozzles include fifth conduit means in communication with said airsupply and the other of said flat nozzles includes sixth conduit meansin communication with said source of volatile chemical solvent and/orwater.
 7. The apparatus as defined in claim 1 wherein said steamgenerating means includes in addition, heating coils, including a waterintake and steam outlet sides, in communication with said water and airinlets and a fuel source for heating said coils.
 8. The apparatus asdefined in claim 6 including means for regulating the flow of air intosaid nozzles.
 9. The apparatus as defined in claim 1 including means forregulating the amount of abrasive flowing from said abrasive storagemeans into said second conduit means.
 10. The apparatus as defined inclaim 1 wherein means for regulating the amount of air entering theabrasive storage means and the second conduit means.
 11. The apparatusas defined in claim 1 including means for regulating the amount of airentering the steam generating means.
 12. The apparatus as defined inclaim 7 including means for reducing pressure of steam flowing out ofthe steam outlet and into the means for directing steam onto the metalsurface.
 13. The apparatus as defined in claim 1 including atransportable base upon which the steam generating means and the meansfor storing abrasive and relates conduits and components can be carried,to make said apparatus portable.